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1 | /* |
2 | * Copyright (C) 2014 Imagination Technologies | |
3 | * Author: Paul Burton <paul.burton@imgtec.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License as published by the | |
7 | * Free Software Foundation; either version 2 of the License, or (at your | |
8 | * option) any later version. | |
9 | */ | |
10 | ||
11 | #ifndef __MIPS_ASM_MIPS_MAAR_H__ | |
12 | #define __MIPS_ASM_MIPS_MAAR_H__ | |
13 | ||
14 | #include <asm/hazards.h> | |
15 | #include <asm/mipsregs.h> | |
16 | ||
17 | /** | |
18 | * platform_maar_init() - perform platform-level MAAR configuration | |
19 | * @num_pairs: The number of MAAR pairs present in the system. | |
20 | * | |
21 | * Platforms should implement this function such that it configures as many | |
22 | * MAAR pairs as required, from 0 up to the maximum of num_pairs-1, and returns | |
23 | * the number that were used. Any further MAARs will be configured to be | |
24 | * invalid. The default implementation of this function will simply indicate | |
25 | * that it has configured 0 MAAR pairs. | |
26 | * | |
27 | * Return: The number of MAAR pairs configured. | |
28 | */ | |
27d8d449 | 29 | unsigned platform_maar_init(unsigned num_pairs); |
ab9988a3 PB |
30 | |
31 | /** | |
32 | * write_maar_pair() - write to a pair of MAARs | |
33 | * @idx: The index of the pair (ie. use MAARs idx*2 & (idx*2)+1). | |
34 | * @lower: The lowest address that the MAAR pair will affect. Must be | |
35 | * aligned to a 2^16 byte boundary. | |
36 | * @upper: The highest address that the MAAR pair will affect. Must be | |
37 | * aligned to one byte before a 2^16 byte boundary. | |
38 | * @attrs: The accessibility attributes to program, eg. MIPS_MAAR_S. The | |
39 | * MIPS_MAAR_V attribute will automatically be set. | |
40 | * | |
41 | * Program the pair of MAAR registers specified by idx to apply the attributes | |
42 | * specified by attrs to the range of addresses from lower to higher. | |
43 | */ | |
44 | static inline void write_maar_pair(unsigned idx, phys_addr_t lower, | |
45 | phys_addr_t upper, unsigned attrs) | |
46 | { | |
47 | /* Addresses begin at bit 16, but are shifted right 4 bits */ | |
48 | BUG_ON(lower & (0xffff | ~(MIPS_MAAR_ADDR << 4))); | |
49 | BUG_ON(((upper & 0xffff) != 0xffff) | |
50 | || ((upper & ~0xffffull) & ~(MIPS_MAAR_ADDR << 4))); | |
51 | ||
52 | /* Automatically set MIPS_MAAR_V */ | |
53 | attrs |= MIPS_MAAR_V; | |
54 | ||
55 | /* Write the upper address & attributes (only MIPS_MAAR_V matters) */ | |
56 | write_c0_maari(idx << 1); | |
57 | back_to_back_c0_hazard(); | |
58 | write_c0_maar(((upper >> 4) & MIPS_MAAR_ADDR) | attrs); | |
59 | back_to_back_c0_hazard(); | |
60 | ||
61 | /* Write the lower address & attributes */ | |
62 | write_c0_maari((idx << 1) | 0x1); | |
63 | back_to_back_c0_hazard(); | |
64 | write_c0_maar((lower >> 4) | attrs); | |
65 | back_to_back_c0_hazard(); | |
66 | } | |
67 | ||
e060f6ed PB |
68 | /** |
69 | * maar_init() - initialise MAARs | |
70 | * | |
71 | * Performs initialisation of MAARs for the current CPU, making use of the | |
72 | * platforms implementation of platform_maar_init where necessary and | |
73 | * duplicating the setup it provides on secondary CPUs. | |
74 | */ | |
75 | extern void maar_init(void); | |
76 | ||
ab9988a3 PB |
77 | /** |
78 | * struct maar_config - MAAR configuration data | |
79 | * @lower: The lowest address that the MAAR pair will affect. Must be | |
80 | * aligned to a 2^16 byte boundary. | |
81 | * @upper: The highest address that the MAAR pair will affect. Must be | |
82 | * aligned to one byte before a 2^16 byte boundary. | |
83 | * @attrs: The accessibility attributes to program, eg. MIPS_MAAR_S. The | |
84 | * MIPS_MAAR_V attribute will automatically be set. | |
85 | * | |
86 | * Describes the configuration of a pair of Memory Accessibility Attribute | |
87 | * Registers - applying attributes from attrs to the range of physical | |
88 | * addresses from lower to upper inclusive. | |
89 | */ | |
90 | struct maar_config { | |
91 | phys_addr_t lower; | |
92 | phys_addr_t upper; | |
93 | unsigned attrs; | |
94 | }; | |
95 | ||
96 | /** | |
97 | * maar_config() - configure MAARs according to provided data | |
98 | * @cfg: Pointer to an array of struct maar_config. | |
99 | * @num_cfg: The number of structs in the cfg array. | |
100 | * @num_pairs: The number of MAAR pairs present in the system. | |
101 | * | |
102 | * Configures as many MAARs as are present and specified in the cfg | |
103 | * array with the values taken from the cfg array. | |
104 | * | |
105 | * Return: The number of MAAR pairs configured. | |
106 | */ | |
107 | static inline unsigned maar_config(const struct maar_config *cfg, | |
108 | unsigned num_cfg, unsigned num_pairs) | |
109 | { | |
110 | unsigned i; | |
111 | ||
112 | for (i = 0; i < min(num_cfg, num_pairs); i++) | |
113 | write_maar_pair(i, cfg[i].lower, cfg[i].upper, cfg[i].attrs); | |
114 | ||
115 | return i; | |
116 | } | |
117 | ||
118 | #endif /* __MIPS_ASM_MIPS_MAAR_H__ */ |